This is a retro Gamepad, or as I call it informally - The Super Plumber pad, which I've designed based around an Arduino Pro Micro clone board. The code for the Arduino is included and just needs to be uploaded to the board using the Arduino IDE software. The only skill required to build this is some soldering.

This project includes all the STL files you need, plus the Gerber files to have the PCB made. I use JLPCB for my own boards. Minimum order is 5 boards and it cost me around £9 with shipping. You just upload the zip file to their site, pick your preferred board colour and leave the rest of the options at default.

PCBWay is another alternative that also does cheap bulk prices.

There's 2 versions of the case included. One is set up for M3 heat inserts, and the other can be built simply by screwing the bolts straight into the plastic. The front faceplate piece should be glued in place.

The start/select button is represented by the coin in the centre. Push the top edge for one button, and the bottom for the other. There's 2 versions of the coin included.

The L/R button pads on the board are spaced for JST headers, but you can also solder the wires straight to the board.

A parts list is included and has some links to eBay, Aliexpress and Amazon for each of the parts as a reference.

The LR buttons pivot on a 3mm steel dowel pin, although I've included an STL file that can also be printed and tried.

Dimensions:
124 x 60 x 24